计算力学学报2016，Vol.33Issue(5)：767-772,6.DOI:10.7511/jslx201605017
横观各向同性油气藏水力压裂裂纹扩展规律研究
Study on the law of transverse isotropic reservoir crack extension during hydraulic fracture
摘要
Abstract
With the difference between transverse isotropic and isotropic reservoir during hydraulic frac-ture,mechanical model was established based on the extended finite element method.Crack criterions were developed by subroutine in ABAQUS.The law of transverse isotropic reservoir crack propagation was studied on the base of which numerical simulation results coincided well with analytical solution re-sults and the field measured curve with isotropic material.It had drawn some conclusions.The crack propagation direction is codetermined by in-situ stress,bedding direction,rock and interface tensile strength.Inj ection pressure produces stress concentration at the crack tip during hydraulic fracturing. Crack extends along the bedding when the stress component normal to interface reaches the interface tensile strength first whereas crack extend vertical to minimum in-situ stress.Crack propagation rate de-creased with increasing of bedding tensile strength.With fracturing fluid inj ection,the crack length and width growth decrease due to the leak-off of formation.关键词
水力压裂/起裂判据/裂纹扩展/扩展有限元/横观各向同性Key words
hydraulic fracturing/crack criterion/crack extension/XFEM/transverse isotropic分类
数理科学引用本文复制引用
孙可明,张树翠,李天舒..横观各向同性油气藏水力压裂裂纹扩展规律研究[J].计算力学学报,2016,33(5):767-772,6.基金项目
国家自然科学基金(11072103)资助项目 （11072103）
